Let A = {P, Q, R, S} and B = {1, 2, 3} w...

Let `A = {P, Q, R, S}` and `B = {1, 2, 3}` which of the following relations from A to B is not a function.

A

`R_(1) = {(p, 1), (q, 2), (r, 1), (s, 2)}`

B

`R_(2) = {(p, 1), (q, 2), (r, 1), (s, 1)}`

C

`R_(3) = {(p, 1), (q, 2), (r, 2), (r, 2)}`

D

`R_(4) = {(p, 2), (q, 3), (r, 2), (s, 2)}`

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The correct Answer is:

C

`because` x - coordinates of two brackets are same.

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